Rule 1.9. Conflict Of Interest: Former Client.

(a) A lawyer who has formerly represented a client in a matter shall not thereafter represent another person in the same or a substantially related matter in which that person's interests are materially adverse to the interests of the former client unless the former client consents after consultation.

(b) A lawyer shall not knowingly represent a person in the same or a substantially related matter in which a firm with which the lawyer formerly was associated had previously represented a client:

(1) whose interests are materially adverse to that person; and

(2) about whom the lawyer had acquired information protected by Rules 1.6 and 1.9(c) that is material to the matter;

unless the former client consents after consultation.

(c) A lawyer who has formerly represented a client in a matter or whose present or former firm has formerly represented a client in a matter shall not thereafter:

(1) use information relating to the representation to the disadvantage of the former client except as Rule 1.6 or Rule 3.3 would permit or require with respect to a client, or when the information has become generally known; or

(2) reveal information relating to the representation except as Rule 1.6 or Rule 3.3 would permit or require with respect to a client.